In studies of self-administration of drugs in animals,cocaine appears to have a _______ compared to heroin.

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Studies have shown that cocaine has a greater potential for psychological dependence compared to heroin. This is because it works by activating the brain's reward system, leading to feelings of pleasure and a desire to repeat the experience, which can lead to addiction. Heroin also has a high potential for dependence, but its effects are primarily physical rather than psychological.

In Studies of Self-Administration of Drugs in Animals,cocaine Appears to Have